Rumex hymenosepalus is the only species of subsect. Hymenosepali Rechinger f.

Two varieties have been recognized. The typical variety has achenes 5 mm and ovate-elliptic or oblong-cordate inner tepals with a subacute apex. Variety salinus (A. Nelson) Rechinger f. has larger achenes (to 7 mm) and almost orbiculate inner tepals with an obtuse apex.

Rumex hymenosepalus was reported also from Montana (J. E. Dawson 1979), but no exact localities were given.